my MM makes me sad

[eovnu87435ds]

so before anybody wants to flame/ etc, my MM is far past it's warranty in time. it also has been just completely re-soldered, and has been run on 4 and 5s.

I just got my MM back from rusty xl-5, and first of all, i have to say he did quite an amazing job! but when i go to arm/calibrate it, it does the startup chime, and then the red and green LEDs flash. this is not one of the LED conditions on the other thread. I've tried resetting factory defaults, and have tried every version of firmware, but to no avail. any clue what's going on?